Crushing and pulverizing mill



(No Model.)

` P. M. DAVIS. GRUSHING ANDPULYERIZING MILL.

- Patented Ninn-29, 1887.

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(No Model.) 4 Sheets-Sheet 2..

F. M. DAVIS.

GRUSHING AND PULVERIZING MILL.

No. $73,817. Patented N0v.29, 1887` gif/f (NO lg/Iddel.) 4 Sheets-Sheet 3.

- w F. M. DAVIS.

GRUSHING A'ND PULVERIZING MILL.

Patented-Nov. Z9, 1887.

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(No Model.) '4 Sheets-Sheet 4.

P. M. DAVIS.

GRUSHING AND PULVERIZING MILL.

No. 873,817. Patented Nov. 29, 1887.

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` y JW/.e t y gygy l UNITED STAT-Es PATENT Ormea.

FRANCIS M. DAVIS, OF DENVER, COLORADO.

CRUSHING AND PULVERIZING IVIILL.

SPECIFICATION forming part of Letters Patent No. 373.817. dated November 29, 1887.

Application lctl June 4, 1886. Serial No.204,1'12. (No model.)

To @ZZ wwm z' may concern:

Be it known'that L FRANcIs M. DAvIs, of Denver, in the county of Arapahoeand State of Colorado, have invented a new and useful Improvement in Crushing and Pulverizing Mills; and Ido hereby declare that the following is a full, clear, and exact description of the same.

My invention is an limprovement upon the crushing and pulverizing mill for which Letters Patent of the United States were granted to Jacob Gherney on the 21st day of April, 1885, No. 316,831.

The improvements consist in the details of construction and combination of the various operating parts, as fully hereinafter explained, and specically claimed.

In the .accompanying drawings, Figure 1 shows a side elevation of my improved mill, one half being in section. Fig. 2 represents an end elevation of my improved mill, one half being in section, taken centrally and vertically. Fig. 3 shows a plan of the machine. Fig. 4 represents a plan view of the drum, the

right-hand half being shown in section to illustrate the return-chute and the spreaders.

In the drawings, the cast-iron ring represented at A takes the place of the ring A4 of the aforesaid patent. This, with the sheet or cast-iron truncated cones O, forms the outer shell or main part of the revolving drum ofy the machine. The ring A is formed with bearingsurfaces a on each side of thechannel b in the center of its periphery. The bearingsurfaces a c rest upon friction-rollers F F F, the roller F being on one side of the vertical axis of the crushing-rolls and the roller F on the other side, with the said roller F between and in vertical line with the axis, as represented in Fig. 1. The ring is held in place by means of fianges c, which project from the outer edges of the ring and bear against the y outer vertical faces of the flanges of the rollers ward or from the flanges by means of setscrews, as shown clearly in Fig. 2. The drum may be driven either by a link-belt or gear, the teeth of which are formed in the channel to the ring A.

On each side isa friction-.-

or groove b in the center of the ring between the bearing-surfaces a a, as in Fig. 1. There is space between the rollers F F for either a gear-wheel or a sprocket-chain. The rollers G serve to steady and maintain the ring always in a central position.

To the inner beveled surface of the ring A is secured a hard-iron shoe, D, which is held in place by cast-iron wedges E, inserted on each side and drawn together by bolts c. This construction is shown in Fig. 2, which also represents the outer periphery of the ring D as beveled.

On a shaft, G', niountedin suitable bearings, hereinafter described, is carrieda freely-running roller, B B. It is considerably less in diameter than the interior diameter of the hard-iron shoe D, and it is so placed, with its shaft G below the axial line of the said shoe, as to bear normally against the lower interior surface thereof, answering the same purpose as the roller J in the previous patent referred to-nannely, that of crushing or pulverizing the material. It is composed of a core, B, and an outer ring or shell, B', to the outer beveled surface of which is secured a hardiron wearing-shoe,O. The connection between these parts is effected by means of wedges E and the bolts e, exactly as the shoe D is held It will be observed that the outer surface of the ring B and the inner surface of ring A are beveled from a central point at a to each edge, and that the rings C and D are also beveled from a central point to each edge, but in a direction opposite to that of the surface of the parts first named. By this construction the adjustment of the shoe and crushing-surface may be accurately effected and the placing and fitting of the same readily made without possibility of displacement. The roller so formed is mounted on the shaft G, above referred to, which is supported in bearings U, which have vertical movement in the grooved slots in the standards T on each side of the machine. On the upper side of each bearing are placed upper and lower plates, V V, between which are springs held down adjustably by set-screws, by means of which any given amount of pressure may be applied, so that the roller may be adjusted to give the proper pressure on the inner periphery of the ring A, but at the same time may edge of the cone.

be allowed to have a slight rise against the springs to permit the passage of any substance too hard to crush. This inner roller receives its motion from the ring A. of the drum by reason of its contact with the shoe D.

The cones (or segments of cones) O are formed cach of a sheet or cast iron shell, E, supported upon a cast-iron frame. The cast-iron frame consists of an outer ring, N, and an inner ring, a, of smaller diameter than the outer, the rings being connected by bars q. The shell or casting E is fitted snugly over the frame, and the structure is held to the ring A by screws r. Vithin the cones are screens S,held,as shown in Fig. 2,at their inner edges between the ring n and a iiange on the ring A, and at their outer edges between the ring N and a iiange or lip on the cover-plates N. The screens are formed preferably of punched sheet metal, and extend continuously around on the inner periphery of the cone. The coverplatcs N also serve to support a series of inclined buckets, M, located in the lower outer These carry up the material which passes down over the screen to its lower edge and deliver this material to the chute, as hereinafter explained. The tine material, whether introduced to the screens directly from the supply-chute or issuing between the crushingsuri'aces, passes down through the screens S into the annular spaces inside the cones and out into the troughs I. These troughs are fixed to the base, as shown in scction at Fig. 2, and surround the ends of the cones, and they support the covers by which the machine is closed for dry crushing. The spaces between the outer surfaces of the sheet or cast iron cones ou each side of the inner edges of the troughs P are packed with tlexible strips y, which are attached to the edges of the troughs and extend up, bending inward and lapping upon the cones completely around the outer peripherics thereof. They are held in their proper position in relation to the cones by the wrought-iron bands Z. The outer end of each cone is closed by the iron cover R, when crushing dry material. This is madein three pieces, one of which isin the center and stationary, and the other two, one on each side, are hinged to the center piece to form doors, which are held, when closed, by buttons 2:. The center piece on cach side serves to support the return-troughs L, as plainly shown at 4 in Fig. 2, and for this purpose are strengthened by the brackets f, which are secured to the standards T. The return-troughs are arranged within the cones ou each side of the crushingroller. For this purpose they extend in an inclined direction from the outer ends of the cones inwardly toward the crushing-roller, as shown by dotted lines on the left of Fig. 2. They are so positioned that as the buckets M rise, by reason ofthe revolution of the concs, the line of travel of said buckets will be directly over them, so that any ma-` terial which the buckets may contain will be deposited in the troughs. On the inner ends ofthe troughs are secured spreaders W, (shown clearly in Fig. 4,) which extend in front of the periphery of the roller B B', and deliver the material evenly over the crushing-surface between the roller and the shoe D.

In wet-crushing machines, where the covers R are not used, the return-troughs L are supported by being directly fastened to the standards. They should extend close to the screens, so as to catch all the material which is elevated by the buckets. The spreaders are pivoted, as shown at 52 in Fig. 2, so that they can be opened or moved out from the position directly over the crushing surface at the will of the operator.` This is done by means of the rod X. (ShowninFig2.) When the spreaders are moved out, they deliver the material back upon the screen and allow none to pass under the roller. Each trough l) has a dischargeorifice, p, extending down to the base of the machine, so that the material delivered through the screen and falling onto the inner surface of the cones will pass through the annular space between the outer edges of the'concs and the edges of the cover-platcs N.

The machine is fed through an opening or openings in the coveuplates into a chute or chutes, K. As shown in Fig. 4, the chute or trough K extends inwardly from a hinged section of the cover R. It is supported upon one side by a, hinge (shown in dotted lines) and upon the other side by a bolt or bolts, Ki. Byreinoving these bolts the trough maybe swung so asto permit the section ofthe cover being opened. The troughs L extend in au inclined position, as shown in Fig. 2, across the space within the cones and terminate over the crushing-surface. The machine turns in the direction ofthe arrows, Fig. 1, so that the material delivered upon the crushing-surface does not pass directly under the roller, and whatever is already line enough passes directly out through the screens, from which it is delivered through the troughs P. The feedtroughs serve to support the scraper F3, which must be used for ores damp enough to pack.

The action of the machineis as follows: The ore is fed in through the trough K' to the front of the inner roll, where it falls to both sides of the roller, that which is already tine enough running through the screens, while the rest is elevated by the buckets M, dumped into the troughs L, runs down into the spreaders W, and passes under the rollers. Alter passing under this it runs oft' on both sides over the screens, and that which is tine enough passes through. The screenings fall onto the cones O, and from them into the troughs P. Just before stopping the machine the spreaders W are opened and the material allowed to run out onto the screens. It' this were not done there would be a large accumulation of material in front of the roller,and it would be difficult to start the machine again.

I claim as my invention- 1. In a drum for pulverizing-mills, dre., and in combination, aring, A, having an interior IOO izing-machine, the skeleton frames secured to said ring, the screens supported by said frames,

and the metallic cones O, extending around the skeleton frames and covering the same, substantiallyl as described.

3. In combination with the central ring, A, the skeleton frames secured thereto, consisting of the bars q and suitable securing-rings, N n, the screens supported by said frames, and the cone-shaped coverings of larger diameter than the said frames or screens, whereby` annular spaces are formed for the discharge of the screened material, substantially as described.

4. In combination with the central ring, A, and roller of a pulverizing-mill, the screens suitably supported,the outwardly-flaring couecoverings surrounding the same, whereby annular spaces are formed between said parts, and troughs surrounding the outer ends of said cones, substantially as described.

5. In a crushing-mill and in combination, a central ring, A, a roller working within the same, the skeleton frames consisting of bars q and outer andinner rings, N and n, the covering-plates N, supported by said frames, and

*the buckets M, substantially as described.

6. In a crushing-mill and in combination, a central ring, A, a roller Working Within the same, the skeleton frames consisting of bars q and outer and inner rings, N and u, the covering-plates N', the buckets M, and returntroughs, all substantially as described.

7 In combination with the central ring, A, and roller B,the cones, the buckets supported, substantially as described, 'within said cones,

the returntroughs,and the movable spreaders W, substantially as described.

8. In a crushing-mill, and in combination, the cones,the screens suitably supported therein, the troughs surrounding the ends of the cones, and the covers R, forming With said troughs a complete inclosure for the ends of the cones, substantially as described.

`9. In combination, the crushing-roller of a pulverizing-machine, having its surface beveled from a central line'to each of its edges, a wearing-shoe for said roller, having its surface adapted to the surface of the roller and beveled from a central line to each edge and in a direction opposite to that of the beveled surface of the roller, wedges upon either side of the central line of said surfaces, and bolts and nuts for securing said Wedges, substantially as described.

10. A cone for crushing-mills,provided with the skeleton frame consisting of the bars q and outer and inner rings, N and n, the plates N', provided with flanges,and the screens held at their outer edges between the said flanges and the ring N and supported at their inner edges by the rings A and n, substantially as described.

1l. In combinatiomthe revolving drum provided With a crushing-surface, and screens at the sides of said surface, the crushing-roller arranged within said drum and engaging with the crushing surfacev thereof, a feed chute placed to one side of the center of said drum and discharging upon the front side of said roller, elevating buckets within said drum, and a returnchute discharging upon the rear side thereof, said roller and drum being revolved from the point of work toward the feed-chute, substantially as described, and for the purpose set forth.

In testimony whereof I have signed my name to. this specification in the presence of two subscribing Witnesses.

FR ANOIS M. DAVIS.

Witnesses:

J A. COOPER, F. C. KITHAM. 

